Ewa Aulin

Candy Christian

Charles Aznavour

Hunchback juggler

Marlon Brando

Grindl

Richard Burton

MacPhisto

James Coburn

Dr. A.B. Krankheit

John Huston

Dr. Arnold Dunlap

Walter Matthau

Gen. R.A. Smight

Ringo Starr

Emmanuel

John Astin

T.M. Christian / Jack Christian

Elsa Martinelli

Livia

Sugar Ray Robinson

Zero

Anita Pallenberg

Nurse Bullock

Lea Padovani

Silvia Fontegliulo

Florinda Bolkan

Lolita

Marilù Tolo

Marquita

Umberto Orsini

The Big Guy

Enrico Maria Salerno

Jonathan J. John

Nicoletta Machiavelli

Marquita

Neal Noorlag

Harold

Enzo Fiermonte

Al Pappone

Peter Dane

Luther

Peggy Nathan

Miss Quinby

Anthony Foutz

Mobster

Tom Keyes

Mobster

Mark Salvage

Dr. Harris

Joey Forman

The Cop

Micaela Pignatelli

Girl

Fabian Dean

The Sergeant

Christian Marquand

Film Director (uncredited)

Buck Henry

Mental Patient (uncredited)

Judith Malina

Woman (uncredited)

Julian Beck

Hippie (uncredited)

Romano Targa

Max (uncredited)

Susan Bottomly

Extra